My divorce is not finalized, so I guess it would give her lawyers something to attack me with, but we have a pretty amicable split, so no big worries.
In the beginning of our relationship, it would have been a lot of shouting and emotional stuff, but by the end, I guess she would not have cared that much, however, I only started visiting WLs after we had split.
My advice, if you have nothing left to lose, then go find a WL, it can be very rewarding. If you feel you still have a lot to lose, then go find a marriage counselor and try to get your relationship back on track.
Which ever course you decide on, always assume that the very worst WILL happen - ie that she will find out. If you consider that, and don't care, then your relationship is probably over anyway !
Best of luck !
Cheers.